Cited by 1,076Chronic Obstructive Pulmonary Disease (COPD) ResearchCardiovascular and exercise physiologyRespiratory Support and Mechanisms

Dynamic Hyperinflation and Exercise Intolerance in Chronic Obstructive Pulmonary Disease

O'DONNELL, DENIS E., REVILL, SUSAN M., WEBB, KATHERINE A.·2001·American Journal of Respiratory and Critical Care Medicine

Abstract

The role of dynamic hyperinflation (DH) in exercise limitation in chronic obstructive pulmonary disease (COPD) remains to be defined. We examined DH during exercise in 105 patients with COPD (FEV(1) = 37 +/- 13% predicted; mean +/- SD) and studied the relationships between resting lung volumes, DH during exercise, and peak oxygen consumption (VO(2)). Patients completed pulmonary function tests and incremental cycle exercise tests. We measured the change in inspiratory capacity (Delta IC) during exercise to reflect changes in DH. During exercise, 80% of patients showed significant DH above resting values. IC decreased 0.37 +/- 0.39 L or 14 +/- 15% predicted during exercise (p < 0.0005), but with large variation in range. Delta IC correlated best with resting IC, both expressed %predicted (r = -0.50, p < 0.0005). Peak VO(2) (%predicted maximum) correlated best with the peak tidal volume attained (VT standardized as % of predicted vital capacity) (r = 0.68, p < 0.0005), which, in turn, correlated strongly with IC at peak exercise (r = 0.79, p < 0.0005) or at rest (r = 0.75, p < 0.0005). The extent of DH during exercise in COPD correlated best with resting IC. DH curtailed the VT response to exercise. This inability to expand VT in response to increasing metabolic demand contributed importantly to exercise intolerance in COPD.

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Crossref · 10.1164/ajrccm.164.5.2012122

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  • In patients with COPD, exhalation may not be completed prior to the onset of the next breath, causing an increase in operational lung volumes and progressive air retention called air trapping.

    “As a result, exhalation may not be completed prior to the onset of the next breath, causing an increase in operational lung volumes and progressive air retention called “air trapping”.13,26,34”
  • Exercise intolerance and lung hyperinflation are closely interrelated in COPD.

    “Despite the difficulties in establishing a cause-effect relationship, exercise intolerance and lung hyperinflation are closely interrelated in COPD.13,14”
  • When comparing two patients with similar FEV1, the one presenting with a reduced diffusion capacity, more severe small airway obstruction, and a higher ventilatory response to exercise will tend to develop more dynamic hyperinflation early during exercise.

    “However, when comparing two patients with similar FEV1, the one presenting with a reduced diffusion capacity, more severe small airway obstruction, and a higher ventilatory response to exercise will tend to develop more dynamic hyperinflation early during exercise.13”
  • A small proportion of patients with COPD (~15%-20%) do not dynamically hyperinflate during exercise even though they still experience intolerable dyspnea.

    “Although dynamic hyperinflation is a cardinal feature of COPD with important physiological consequences, a small proportion of patients (~15%–20%) do not dynamically hyperinflate during exercise even though they still experience intolerable dyspnea.13,42,57”
  • In a larger cohort of COPD patients (n=105), the VT/IC ratio was the strongest predictor of exertional dyspnea based on multiple linear regression analysis.

    “A subsequent study in a larger cohort of COPD patients (n=105) demonstrated that the VT/IC ratio, an index of EILV and VT constraint, was the strongest predictor of exertional dyspnea based on multiple linear regression analysis.13”

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Authors
O'DONNELL, D. E., REVILL, S. M., & WEBB, K. A.
Affiliations
  • Respiratory Investigation Unit, Department of Medicine, Queen's University, Kingston, Ontario, Canada
  • Queen's University (CA)
Venue
American Journal of Respiratory and Critical Care Medicine
Published
2001-09-01
Volume
164
Issue
5
Pages
770-777
ISSN
  • 1073-449X (ISSN-L)
  • 1535-4970
OpenAlex
W1981434879
Cited by
1,076
References
3
Citations by year
2026: 23 · 2025: 29 · 2024: 26 · 2023: 30 · 2022: 33 · 2021: 35 · 2020: 50 · 2019: 41 · 2018: 56 · 2017: 43 · 2016: 46 · 2015: 48 · 2014: 51 · 2013: 47 · 2012: 65
FWCI
20.55
Type
journal article
Language
en
Open access
closed
Locations
  • American Journal of Respiratory and Critical Care Medicine (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Pulmonary and Respiratory Medicine › Chronic Obstructive Pulmonary Disease (COPD) Research
  • Health Sciences › Medicine › Complementary and alternative medicine › Cardiovascular and exercise physiology
  • Health Sciences › Medicine › Pulmonary and Respiratory Medicine › Respiratory Support and Mechanisms
Keywords
dynamic hyperinflation, chronic obstructive pulmonary disease, exercise intolerance, inspiratory capacity, peak oxygen uptake, tidal volume, lung volume, exercise limitation
MeSH terms
Aged, Female, Forced Expiratory Volume, Humans, Male, Middle Aged, Exercise Tolerance, Pulmonary Disease, Chronic Obstructive

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